OPNET based Performance Evaluation of WIMAX Network with WIMAX Management using Different QoS
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1 Available Online at International Journal of Computer Science and Mobile Computing A Monthly Journal of Computer Science and Information Technology IJCSMC, Vol. 3, Issue. 6, June 2014, pg RESEARCH ARTICLE ISSN X OPNET based Performance Evaluation of WIMAX Network with WIMAX Management using Different QoS Neeru Jakhar 1, Ankit 2, Kuldeep Vats 3, Suman 4 1 M.Tech, Department of Electronics and Communication, C.B.S Group of Institute, Jhajjar, Haryana, India Neeru23JK@yahoo.com 2 Assistant Professor, Department of ECE, C.B.S Group of Institute, Jhajjar, Haryana, India akt603@gmail.com 3 B.E. Honors, M.tech, Department of Computer Science Engineering, Sonepat, Haryana, India kuldeepvats@yahoo.com 4 M.Tech, Department of ECE, RN College of Engineering, Rohtak, Haryana, India suman.phogat@gmail.com ABSTRACT- IEEE WiMAX network is designed for providing high speed wide area broadband wireless access. WiMAX is an emerging wireless technology which is used for creating multi-hop mesh networks offering variable and high data rates, QoS, seamless mobility within a network. OPNET modeler is a simulation program tool used to simulate the different types of wireless networks. In this paper, simulation and evaluation of two different sized networks (small, large) is carried out. We are using the modeler to study networks with 35 and 50 mobile workstations. In each network, group of five WiMAX workstations connect and call each other through one WiMAX base stations during 1000sec. Performance of parameters that indicate the quality of services such as WIMAX management Periodic Ranging activity, WIMAX management initial ranging activity, delay, Throughput, neighbor advertisements sent and Network load have been studied. KEYWORDS WiMAX, IEEE , OPNET, QoS 2014, IJCSMC All Rights Reserved 862
2 I. INTRODUCTION IEEE standard Board in 1999 introduced and worked on Broadband Wireless Access Standards which aimed for global deployment of broadband Wireless Metropolitan Area Networks. The family of is known as Wireless MAN which is also known as WIMAX or wireless broadband. IEEE is known as fixed WiMAX and IEEE or e is known as mobile WiMAX. WiMAX is abbreviated as Worldwide Interoperability for Microwave Access which provides broadband connectivity by connecting to the Internet Service Provider even when you are roaming outside home. WiMAX network is a proficient alternative to 3G or wireless networks for providing connectivity over large coverage area with low cost of deployment and high speed data rates. It supports data rates of 70Mbps over ranges of 50km with mobility support at vehicular speeds. WiMAX technology is the only wireless system capable of offering high QoS at high data rates for IP networks. One of the top applications for the is Voice over Internet protocol (VoIP) service to support bidirectional voice conversation [1]. IEEE supports a variety of physical (PHY) layers. Each of them has its own distinct characteristics. First, Wireless MAN-SC (Single Carrier) PHY is designed for 10 to 60 GHz spectrum. While IEEE has standardized this PHY, there are not many products implementing it because this PHY requires line of sight (LoS) communication. Also, rain attenuation and multipath affect reliability of the network at these frequencies. To allow non-line of sight (NLoS) communication, IEEE working group designed the Orthogonal Frequency Division Multiplexing (OFDM) PHY using spectrum below 11 GHz [1]. This PHY is designed for fixed subscriber stations. WiMAX Forum has approved several profiles using this PHY. Most of the current WiMAX products implement this PHY. In this PHY, multiple subscribers use a Time Division Multiple Access (TDMA) to share the media. OFDM is a multi-carrier transmission in which thousands of subcarriers are transmitted and each user is given complete control of all subcarriers. For mobile users, it is better to reduce the number of subcarriers so that the subscriber station can use higher transmission power per subcarrier and increase their signal to noise ratio. This combination of time division and frequency division multiple access in conjunction with OFDM is called Orthogonal Frequency Division Multiple Access (OFDMA). The details of these interfaces can be found in [10]. In upcoming era, WiMAX will substitute other broadband technologies competing in the same segment and will become an excellent solution for the deployment of the well-known last mile infrastructures in places where it is very difficult to get with other technologies, such as cable or DSL, and where the costs of deployment and maintenance of such technologies would not be profitable [2][3]. The main parts of a WiMAX system are the subscriber station (SS) and the base station (BS). A BS can have one or more than one nodes that is subscriber units connected to it. These base stations (BS s) and Subscriber stations (SS s) can form a cell with point to multipoint (P2MP) structure. Multiple BS s can be configured to form a cellular wireless network. WiMAX based systems generally use fixed antenna at the subscriber station site, mounted on heights. A Base Station can use either directional or Omni directional antennas. A stationary Subscriber unit uses directional antenna while mobile or portable Subscriber unit can use an Omni-directional antenna. The standard also can be used in a point to point topology with pairs of directional antennas. This increases the effective range of the system [4] [5]. 2014, IJCSMC All Rights Reserved 863
3 Fig1. P2P and P2MP antennas with WiMAX network. This paper provides an overview of followed by one of most widely used tool for studying the performance of existing systems. It is known as Optimized Network Evaluation Tool (OPNET). The purpose of this study was to examine cases of different QoS deployment over a WiMAX network and to investigate the capability of a WiMAX network to deliver adequate QoS to voice applications. II. OPNET MODELER We are using the Optimized Network Engineering Tool (OPNET v14.5) for simulation of our networks which is one of the most powerful simulation tools regarding wireless communications. OPNET is a research oriented network simulation tool which provides a development environment for modeling and simulation of deployed wired as well as wireless networks and also provides multiple solutions for managing networks and applications e.g. network operation, planning, research and development (R&D), network engineering and performance management. OPNET 14.5 is designed for modeling communication devices, technologies, protocols and to simulate the performance of these technologies. User can create customized models and simulate various network scenarios [6]. It is possible to simulate various wireless communication technologies such as MANET, , 3G/4G, Ultra Wide Band, WiMAX, Bluetooth, ZigBee using OPNET tool. The OPNET modeler is object oriented and employs a hierarchical approach to model communication networks as shown in fig below. The OPNET usability can be divided into four main steps. 1. Modeling : This module is used to build or create a network model 2. Choose and select statistics: We can choose different statistics to collect from each network. 3. Simulate the network. 4. View and analyze results. The OPNET Modeler comprises a series of hierarchical user interfaces including Project, node, process, link model, path, and project editors [7] as shown in figures 2, 3, , IJCSMC All Rights Reserved 864
4 Fig 2. The Network model Fig 3. The Node model Fig4. The Process model 2014, IJCSMC All Rights Reserved 865
5 III. SIMULATION INFRASTRUCTURE AND SCENARIOS FOR WiMAX NETWORK A. SIMULATED TEST BED INFRASTRUCTURE The test bed infrastructure consists of simulated WiMAX network, which is interconnected with real devices defined as nodes. The network topology of our test bed network is given in Figure. We have created three network models with different number of nodes and base stations. These models consist of a circular placement of nodes in a hexagon pattern with variable no. of WiMAX Base Stations each consisting 5 mobile Subscriber Stations (SS). Two OPNET models developed for investigating the performance of WiMAX network resides in a smallscale network of area (1km x 1km). The first scenario consists of 7 base stations and 5 nodes per base station. The second scenario consists of 10 base stations and 5 nodes per base stations as shown in table 1 Table 1 Network model size Network No. of No. of Total No. model base nodes per of nodes stations base station Small Large B. SIMULATION PARAMETER SETUP The Wimax parameters used in the simulation are shown in table 2. Table 2 WiMAX Parameters Parameters Value Simulation speed 270,923 event/sec Node Position Circular Antenna gain (dbi) -15 PHY profile type OFDMA 20 Simulation Time 1000 sec Seed 128 Request retries 16 Maximum no. of SS node 50 Maximum Base station transmission 0.50W power No. of subscriber stations 35,50 No. of initial ranging codes , IJCSMC All Rights Reserved 866
6 IV. OPNET SIMULATION RESULTS This paper investigates the performance of WiMAX network using different quality of services (QoS) which are explained below. A. QUALITY OF SERVICE (QoS) Quality of service (QoS) shows the overall performance of a WiMAX network, seen by the users of that network [8]. To quantitatively measure quality of service, several related aspects of the network service are often considered, such as error rates, bandwidth, throughput, load, transmission delay, availability, jitter, transmission power etc. B. PERFORMANCE METRICS The different performance metrics used in the evaluation of simulation represent the different characteristics of the overall WiMAX network performance. We evaluate the following metrics used to study their effect on the overall network performance. These metrics are: 1) WIMAX Management Initial ranging activity: Initial Ranging activity is one of the most important processes in the WiMAX standard. Synchronization between a Base Station (BS) and all users within a cell and transmission power adjustments are done using the initial ranging activity. Fig 5 WiMAX management initial ranging activity. As shown in fig 5, initial ranges for small and large networks are 790dBm and 540dBm respectively. 2) WIMAX Management Periodic Ranging activity: Periodic Ranging activity is one of the most important processes in the WiMAX standard. Synchronization between a Base Station (BS) and all users within a cell and transmission power adjustments are done using the Periodic ranging activity. 2014, IJCSMC All Rights Reserved 867
7 Fig 6 WIMAX management Periodic Ranging activity As shown in fig 6, Periodic ranges for small and large networks are 1dBm respectively. 3) Delay(sec): The packet end-to-end delay is the time of generation of a packet by the source up to the destination reception. So this is the time that a packet takes to go across the network. This time is expressed in sec. Hence all the delays in the network are called packet end-to-end delay [9]. 2014, IJCSMC All Rights Reserved 868
8 Fig 7. WiMAX delay(sec) If the size of the topology is small then there is no significant delay but as the number of nodes increases in any particular geographic area then end-to-end delay becomes noticeably higher. 4) Neighbor advertisements sent: The neighbor advertisement contains information required by nodes to determine the type of neighbor advertisement message, the sender s role on the network, and typically the link-layer address of the sender. As shown in fig 8, neighbor advertisements sent for small and large networks are 3,500,000 bits/sec respectively. Fig 8. WiMAX mobility neighbor advertisements sent (bits/sec). 2014, IJCSMC All Rights Reserved 869
9 5) Throughput Neeru Jakhar et al, International Journal of Computer Science and Mobile Computing, Vol.3 Issue.6, June- 2014, pg Throughput is defined as the ratio of the total data reached to a receiver from the sender [11][12]. The time receiver takes to receive the last message is known as throughput. Throughput is expressed as bytes or bits per sec (byte/sec or bit/sec). Throughput can be represented mathematically as in equation (ii); After simulation of 1000 sec. throughput values in two models with are show in figure 6. 6) Load Fig 9. WiMAX throughput (packets/sec). Network load represents the total load in bit/sec submitted to wireless LAN layers by all higher layers in all WLAN nodes of the network. When there is more traffic coming on the network, and it is difficult for the network to handle all this traffic then it is called the network load. After simulation of 1000 sec., network load values in two models with are shown in figure , IJCSMC All Rights Reserved 870
10 Fig 10. WiMAX network load (packets/sec) V. CONCLUSION In this paper various QoS attributes based on the scheduler of IEEE are elaborated and compared on three different WiMAX scenarios, showing after simulations the performance of such networks, initial range activity is maximum in Small network with 35 nodes and minimum in large network with 50 nodes. Queuing delay and throughput is maximum in Small network with 35 nodes and minimum in large network with 50 nodes. WiMAX Management periodic ranging activity and Neighbor advertisements sent are equal in both networks. Network load of base stations is lowest in Small network and highest in large network. REFERENCES [1] Iwan Adhicandra, Measuring Data and VoIP Traffic in WiMAX Networks, JOURNAL OF TELECOMMUNICATIONS, VOLUME 2, ISSUE 1, APRIL 2010 [2] M.A. Mohamed, F.W. Zaki and A.M. Elfeki, Performance Analysis of VoIP Codecs over WiMAX Networks, IJCSI International Journal of Computer Science Issues, Vol. 9, Issue 6, No. 3, November 2012 [3] Dr. Mayyada Hammoshi, WiMAX Simulation Model to Investigate Performance Factors, Journal of Convergence Information Technology, Volume 6, Number 1. January [4] WiMAX tutorial [online]. Available: [5] What is WiMAX? [Online]. Available: Com/wimax-tutorial/what-is-wimax. [6] OPNET Modeler [Online]. Available: [7] OPNET product documentation v.11.0.a, OPNET Technologies, Inc., Bethesda, MD, , IJCSMC All Rights Reserved 871
11 [8] Quality of service Wikipedia [Online]. Available: [9]Vats, k. and Sachdeva, M. (2012) Simulation and performance analysis of OLSR, GRP, DSR Routing protocol using OPNET, International Journal of Emerging Trends in Engineering and Development, vol. 2,(2), pp [10] IEEE P802.16Rev2/D2, DRAFT Standard for Local and Metropolitan Area Networks, Part 16: Air Interface for Broadband Wireless Access Systems, December 2007, 2094 pp. 2014, IJCSMC All Rights Reserved 872
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